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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9de5a268f5f9d9da8ed1d7e96929e88be9dfd643fb709de1d071641e0237d940' 
  AND token = 'NHnaXetdTuPadegZJMb3M8UKQsoJbWCGc6MN0fdy/EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00806

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}